Applied Areas:

Mining and processing in non-ferrous and ferrous mines

Slag flushing in steel and iron smelters

Smelting of alumina

 Ash handling and desulfurization at fossil-fuel power plants

Coal washing and dressing

Civil engineering constructions

Conveying of phosphogypsum at phosphate fertilizer plants

 Environmental protection projects

And so on

Multiple designs of shaft seal

NZJ (C) slurry pumps apply different shaft seals regarding different operating conditions

1.  Gland seal: Simple structure; Viable to almost any applied situations; Options available for standard structure and low flowrate structure; Super wear resistant shaft sleeve: ceramic composite sleeve or highly hard alloy sleeve.

2.  Centrifugal Seal: Easiness in maintenance; Leak free in operation; Expeller and expeller ring also made of wear resistant material; Super wear resistant shaft sleeve.

3.  Mechanical Seal: Specifically designed for slurry conveying, leak free; Integral cartridge structure, free of influence of impeller axial adjustment, minimized influence of installation tolerance, easiness in installation; Balance design; Seal ring applying static pressure sintered SiC/SiC or WC/WC; Seal gasket made of fluoroelastomer, structural material of 316 or others (dependent on slurry properties); Open type design of seal box to prevent slurry settlement; Multiple flushing options and structures;

Impeller Structure

Single stage single suction, centrifugal type; Suction end mechanical seal; Back vanes provided on front and back shrouds; Threaded connection with main shaft, standard metric thread; Impellers designed with vane numbers of 2, 3, 4, 5 and 6 depending on different operating conditions and slurry characteristics; Impellers designed with shrouded or semi open type depending on different operating conditions and slurry characteristics; Diameter of impeller can be altered in a certain range;

Casing structure

Dual casings, radial split;

Inner liners to withstand slurry abrasion and corrosion, outer casings to withstand pressure and protect inner liners;

Replaceable inner liners;

Inner liners can apply different abrasion and corrosion resistant materials;

Outer casings are made of  grey iron or ductile cast iron;

Sizes to intake and discharge joint flanges conform with the National Standard.

Design of heavy duty bearing assembly

Large bearing span design, overhang/bearing span smaller than 1;

Heavy duty metric roller bearing, capable of withstanding heavy axial and radial loads, calculated service life greater than 40,000hr;

Main shaft made of premium carbon steel, with high strength and fatigue durability;

Large shaft diameter design, coping with heavy loads and tough operating conditions;

Forced oil lubrication, resulting in better lubrication and a lower bearing operational temperature;

External cooling interface prepared, being available for extreme temperature conditions;

Contact + non contact composite bearing seal, simple and reliable;

Adjustable axially, ensuring a clearance for the impeller in the pumping chamber;

Axial split bearing cartridge, offering easiness for maintenance and repairs of bearing components;